Hello!
Have a look at Ferroxcube (Philips) cores of 3F3 material. As far as I can
interpret datasheets for these, they should work fairly well as transformers up
to 500kHz with a DC component and up to 1MHz without DC.
I think Gus/SM6BHZ has been using these on at least 500kHz and can perhaps
report on success/failure here.
73's
Paul-Henrik / OH1LSQ
Quoting Alan Melia <[email protected]>:
> Lee, I think the 3C85s were made by Philips and I susppect they have sold of
> that line look under Neosid, and Epcos (though my link to the latter does
> not seem to work now, but it is a couple of years since I was searching
> their site. Just look for the right sized core in a material with a
> permiability of around 4000, you can get higher values but I believe these
> may be a bit more lossy. The other trick is to look up the "turns per mH"
> (or uH) then wid a few turns on an unknown core and see what the inductance
> comes out at. I bout a couple of massive cores at Donning a couple of years
> back that had brown and blue mains wire wrapped round them. They were about
> 6in diam and were brilliant for transformers. The 56uH that was refered to
> is for the LPF and inductors for these should never be wound on ferrite, low
> permiability iiron dust possibly but air cored on a 38mm white waste pipe is
> by far the best. Just make sure the coil axes are orthogonal if they are not
> screened as the stray fields are much higher than from toroids.
>
> Some ideas here
> http://www.alan.melia.btinternet.co.uk/toroids.htm#ferrite%20toroids
>
> Alan G3NYK
>
>
> ----- Original Message -----
> From: "Lee Hudson" <[email protected]>
> To: <[email protected]>
> Sent: Wednesday, November 19, 2008 6:51 PM
> Subject: LF: 3C85/90 Toroids
>
>
> > Hi,
> >
> > Any suggestions for suppliers of Toroids made from 3C85/90 material rather
> > than stripping down old SMPS?
> >
> > 73,
> > Lee
> > M0LMH
> >
> >
>
>
>
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